package com.atguigu.stream.exer02;

import org.junit.Before;
import org.junit.Test;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import java.util.stream.Stream;

public class TestTransaction {

    List<Transaction> transactions = null;

    @Before
    public void before() {
        Trader raoul = new Trader("Raoul", "Cambridge");
        Trader mario = new Trader("Mario", "Milan");
        Trader alan = new Trader("Alan", "Cambridge");
        Trader brain = new Trader("Brain", "Cambridge");

        transactions = Arrays.asList(
                new Transaction(brain,2011,300),
                new Transaction(raoul,2012,1000),
                new Transaction(raoul,2011,400),
                new Transaction(mario,2012,710),
                new Transaction(mario,2012,700),
                new Transaction(alan,2012,950)
        );
    }

    // 1、找出2011年发生的所有交易，并按交易额排序(从低到高)
    @Test
    public void test1() {
        transactions.stream()
                .filter((t) -> t.getYear() == 2011)
                .sorted((t1, t2) -> Integer.compare(t1.getYear(), t2.getYear()))
                .forEach(System.out::println);
    }

    // 2、交易员都在哪些不同的城市工作过
    @Test
    public void test2() {
        transactions.stream()
                .map((t) -> t.getTrader().getCity())
                .distinct()
                .forEach(System.out::println);
    }

    // 3、查找所有来自剑桥的交易员，并按姓名排序
    @Test
    public void test3() {
        transactions.stream()
                .filter((t) -> t.getTrader().getCity().equals("Cambridge"))
                .map(Transaction::getTrader)
                .sorted((t1, t2) -> t1.getName().compareTo(t2.getName()))
                .distinct()
                .forEach(System.out::println);
    }

    // 4、返回所有交易员的姓名字符串，按字母顺序排序
    @Test
    public void test4() {
        transactions.stream()
                .map((t) -> t.getTrader().getName())
                .sorted()
                .distinct()
                .forEach(System.out::println);

        System.out.println("-------------------------------------");

        String str = transactions.stream()
                .map((t) -> t.getTrader().getName())
                .sorted()
                .reduce("", String::concat);

        System.out.println(str);

        System.out.println("---------------------------------------");

        transactions.stream()
                .map((t) -> t.getTrader().getName())
                .flatMap(TestTransaction::filterCharacter)
                .sorted((s1,s2) -> s1.compareToIgnoreCase(s2))
                .forEach(System.out::print);
    }

    public static Stream<String> filterCharacter(String str) {
        List<String> list = new ArrayList<>();
        for (Character ch : str.toCharArray()) {
            list.add(ch.toString());
        }
        return list.stream();
    }

    // 5、有没有交易员是在米兰工作的
    @Test
    public void test5() {
        boolean b = transactions.stream()
                .anyMatch((t) -> t.getTrader().getCity().equals("Milan"));
        System.out.println(b);
    }

    // 6、打印生活在剑桥的交易员的所有交易额
    @Test
    public void test6() {
        Optional<Integer> sum = transactions.stream()
                .filter((t) -> t.getTrader().getCity().equals("Cambridge"))
                .map(Transaction::getValue)
                .reduce(Integer::sum);
        System.out.println(sum.get());
    }

    // 7、所有交易额中，最高的交易额是多少
    @Test
    public void test7() {
        Optional<Integer> max = transactions.stream()
                .map((t) -> t.getValue())
                .max(Integer::compare);
        System.out.println(max.get());
    }

    // 8、找到交易额最小的交易
    @Test
    public void test8() {
        Optional<Transaction> min = transactions.stream()
                .min((t1, t2) -> Integer.compare(t1.getValue(), t2.getValue()));
        System.out.println(min.get());
    }

}
